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ipv6: Flip to fib_nexthop_info

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Export fib_nexthop_info and fib_add_nexthop for use by IPv6 code.
Remove rt6_nexthop_info and rt6_add_nexthop in favor of the IPv4
versions. Update fib_nexthop_info for IPv6 linkdown check and
RTA_GATEWAY for AF_INET6.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-02 14:11:58 -07:00 committed by David S. Miller
parent c236419981
commit c0a720770c
3 changed files with 28 additions and 76 deletions
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5
include/net/ip_fib.h
View File

@ -492,4 +492,9 @@ u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr);
int ip_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
struct fib_dump_filter *filter,
struct netlink_callback *cb);
int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nh,
unsigned int *flags, bool skip_oif);
int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nh,
int nh_weight);
#endif /* _NET_FIB_H */

22
net/ipv4/fib_semantics.c
View File

@ -45,6 +45,7 @@
#include <net/nexthop.h>
#include <net/lwtunnel.h>
#include <net/fib_notifier.h>
#include <net/addrconf.h>
#include "fib_lookup.h"
@ -1317,8 +1318,8 @@ failure:
return ERR_PTR(err);
}
static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc,
unsigned int *flags, bool skip_oif)
int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc,
unsigned int *flags, bool skip_oif)
{
if (nhc->nhc_flags & RTNH_F_DEAD)
*flags |= RTNH_F_DEAD;
@ -1332,6 +1333,10 @@ static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc
if (ip_ignore_linkdown(nhc->nhc_dev))
*flags |= RTNH_F_DEAD;
break;
case AF_INET6:
if (ip6_ignore_linkdown(nhc->nhc_dev))
*flags |= RTNH_F_DEAD;
break;
}
rcu_read_unlock();
}
@ -1342,6 +1347,11 @@ static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc
if (nla_put_in_addr(skb, RTA_GATEWAY, nhc->nhc_gw.ipv4))
goto nla_put_failure;
break;
case AF_INET6:
if (nla_put_in6_addr(skb, RTA_GATEWAY,
&nhc->nhc_gw.ipv6) < 0)
goto nla_put_failure;
break;
}
}
@ -1362,10 +1372,11 @@ static int fib_nexthop_info(struct sk_buff *skb, const struct fib_nh_common *nhc
nla_put_failure:
return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(fib_nexthop_info);
#ifdef CONFIG_IP_ROUTE_MULTIPATH
static int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,
int nh_weight)
#if IS_ENABLED(CONFIG_IP_ROUTE_MULTIPATH) || IS_ENABLED(CONFIG_IPV6)
int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,
int nh_weight)
{
const struct net_device *dev = nhc->nhc_dev;
struct rtnexthop *rtnh;
@ -1391,6 +1402,7 @@ static int fib_add_nexthop(struct sk_buff *skb, const struct fib_nh_common *nhc,
nla_put_failure:
return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(fib_add_nexthop);
#endif
#ifdef CONFIG_IP_ROUTE_MULTIPATH

77
net/ipv6/route.c
View File

@ -4582,73 +4582,6 @@ static size_t rt6_nlmsg_size(struct fib6_info *rt)
+ nexthop_len;
}
static int rt6_nexthop_info(struct sk_buff *skb, const struct fib6_nh *fib6_nh,
unsigned int *flags, bool skip_oif)
{
if (fib6_nh->fib_nh_flags & RTNH_F_DEAD)
*flags |= RTNH_F_DEAD;
if (fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN) {
*flags |= RTNH_F_LINKDOWN;
rcu_read_lock();
if (ip6_ignore_linkdown(fib6_nh->fib_nh_dev))
*flags |= RTNH_F_DEAD;
rcu_read_unlock();
}
if (fib6_nh->fib_nh_has_gw) {
if (nla_put_in6_addr(skb, RTA_GATEWAY, &fib6_nh->fib_nh_gw6) < 0)
goto nla_put_failure;
}
*flags |= (fib6_nh->fib_nh_flags & RTNH_F_ONLINK);
if (fib6_nh->fib_nh_flags & RTNH_F_OFFLOAD)
*flags |= RTNH_F_OFFLOAD;
/* not needed for multipath encoding b/c it has a rtnexthop struct */
if (!skip_oif && fib6_nh->fib_nh_dev &&
nla_put_u32(skb, RTA_OIF, fib6_nh->fib_nh_dev->ifindex))
goto nla_put_failure;
if (fib6_nh->fib_nh_lws &&
lwtunnel_fill_encap(skb, fib6_nh->fib_nh_lws) < 0)
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
/* add multipath next hop */
static int rt6_add_nexthop(struct sk_buff *skb, const struct fib6_nh *fib6_nh)
{
const struct net_device *dev = fib6_nh->fib_nh_dev;
struct rtnexthop *rtnh;
unsigned int flags = 0;
rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
if (!rtnh)
goto nla_put_failure;
rtnh->rtnh_hops = fib6_nh->fib_nh_weight - 1;
rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;
if (rt6_nexthop_info(skb, fib6_nh, &flags, true) < 0)
goto nla_put_failure;
rtnh->rtnh_flags = flags;
/* length of rtnetlink header + attributes */
rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static int rt6_fill_node(struct net *net, struct sk_buff *skb,
struct fib6_info *rt, struct dst_entry *dst,
struct in6_addr *dest, struct in6_addr *src,
@ -4765,19 +4698,21 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
if (!mp)
goto nla_put_failure;
if (rt6_add_nexthop(skb, &rt->fib6_nh) < 0)
if (fib_add_nexthop(skb, &rt->fib6_nh.nh_common,
rt->fib6_nh.fib_nh_weight) < 0)
goto nla_put_failure;
list_for_each_entry_safe(sibling, next_sibling,
&rt->fib6_siblings, fib6_siblings) {
if (rt6_add_nexthop(skb, &sibling->fib6_nh) < 0)
if (fib_add_nexthop(skb, &sibling->fib6_nh.nh_common,
sibling->fib6_nh.fib_nh_weight) < 0)
goto nla_put_failure;
}
nla_nest_end(skb, mp);
} else {
if (rt6_nexthop_info(skb, &rt->fib6_nh, &rtm->rtm_flags,
false) < 0)
if (fib_nexthop_info(skb, &rt->fib6_nh.nh_common,
&rtm->rtm_flags, false) < 0)
goto nla_put_failure;
}